We spent a nice time at Nonnakorn's flat. Very nice flat (even if it looks more like a hotel than someone's house) not so far from Sanampao BTS metro station. We could used the washing machine and see some movies in English.
We didn't know that the check in time was at 14h and we arrived at 12h so the flat wasn't available. Nonnakorn's girlfriend arranged something for us in order to leave our luggages. That was very nice.
Bad point : the mattress wasn't comfortable.